P1400
Differential Pressure Feedback Electronic Sensor Circuit Low Voltage
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)
Symptoms
- Check Engine Light Is On
- Reduced engine power
- Unstable idling
- Increased fuel consumption
- Dips during acceleration
Causes
- EGR differential pressure sensor malfunction
- Open or short circuit in the sensor circuit
- Poor contact in the sensor connector
- Wiring Harness Problems
- Engine control unit malfunction
How to Fix
- Check the integrity of wiring and connectors
- Measure resistance and voltage at the sensor
- Check the operation of the EGR valve
- Replace differential pressure sensor if necessary
- Clean or replace the EGR valve if dirty